|| tryflag CFLAGS_C99FSE -fno-builtin
tryflag CFLAGS_C99FSE -fexcess-precision=standard \
|| tryflag CFLAGS_C99FSE -ffloat-store
|| tryflag CFLAGS_C99FSE -fno-builtin
tryflag CFLAGS_C99FSE -fexcess-precision=standard \
|| tryflag CFLAGS_C99FSE -ffloat-store